That is extremely well known—so much so that people rush to repeat it on every relevant, and many an irrelevant, occasion. Please see my reply at https://news.ycombinator.com/item?id=19821356.
The issue here was conflating all Chinese commenters with CCP astroturfers and representing them as vampires who need to be "warded off". It's great that you're concerned with discussion integrity on HN—so are we, very much—but please take care that garden-variety prejudice doesn't leach into this. That happens so easily as to be a bigger problem than the astroturfing people complain about, which they frequently imagine to be happening based on zero evidence. I've written about this a great deal if anyone wants more: https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme...
The issue here was conflating all Chinese commenters with CCP astroturfers and representing them as vampires who need to be "warded off". It's great that you're concerned with discussion integrity on HN—so are we, very much—but please take care that garden-variety prejudice doesn't leach into this. That happens so easily as to be a bigger problem than the astroturfing people complain about, which they frequently imagine to be happening based on zero evidence. I've written about this a great deal if anyone wants more: https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme...